[Fot] Gear ratio recommendations

[David Gott]

Hi Dave,
At lime rock a 3.7 with stock ratios you will only use 3 and 4.  When I lost the ability to downshift, I found I could still be within a second of pace just leaving it in 4th the whole way…. With an engine tuned for midrange power, shifting (when possible) at 6k.    Bogging a little out of the esses.  Probably taught me a lot when you take away options (how do I keep it in the rev. range???)   A true momentum track.  I try to convince myself that I’m a freight train not having to shift while others go through 3 gears losing momentum each time next to me down the straight.   Did I mention I have rose colored glasses?
Dave Gott


Sent from Yahoo Mail for iPhone


On Tuesday, March 25, 2025, 6:46 AM, Philip Gott via Fot <fot at autox.team.net> wrote:

Dave;With that power and a 6k red line the 3.7 will do you just fine at Lime Rock assuming you have 23 inch tires.Phil Gott

Sent from my iPhone

On Mar 25, 2025, at 12:07 AM, Dave Riddle via Fot <fot at autox.team.net> wrote:




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While we will be running the Toyota 5 speed in the TR4 at Lime Rock that gear box and engine are slated to go back in the BajaTR3 afterwards.  The motor that is being built for the TR4 is being mated to a 4-speed TR4 box that has been order.  Trying to determine what gear ratios to run in it.  Will have both a 3.71 and 4.11 final drive and the motor turning over at 6k with about 175 hp at the rear wheels.
 
  
 
Currently the Toyota boxes we have are running…
 
  
 
1st           3.950                    3.830
 
2nd          2.140                    2.060
 
3rd           1.38                       1.430
 
4th           1.00                       1.00
 
5th           0.810                    0.840
 
  
 
Anyone care to share the hot setup for a 4-speed TR4 box?
 
  
 

<image001.jpg> 
Dave Riddle
 
Business IT Consulting
 
Office: 480.610.8234
 
Cell: 602.692.5276
 
eMail: dave at microworks.net
 
Website: http://www.microworks.net
 

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